Illumination of solutions of spiroquinoxazine 1 yields both a coloured species and a fluorescent species, both of which are reverse photochromic and both of which are trapped by bivalent metal ion complexation.
M. J. Preigh, F. Lin, K. Z. Ismail and S. G. Weber, J. Chem. Soc., Chem. Commun., 1995, 2091 DOI: 10.1039/C39950002091
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